Loom letoff



June 18, 1940. MOORE AL 2,205,149

Loo! LETOFF Filed April 12, 1939 2 Sheets-Sheet 1- Inventors ZZZ/70 are, 5? Q/Varmw A iiomeys Patented June 18, 1940 UNITED STATES PATENT oFFicE Application April 12, 1939, Serial No. 267,496

1 Claim.

This invention appertains to new and useful improvements in looms and more particularly to the usual letoif pinion shaft and external gear such as is well illustrated in the patent to C. F. Roper,

No. 843,181, filed March 15, 1906, for Letoff mechanism for looms.

The principal object of the present invention is to provide an improvement of the character stated which in use will reduce the amount of inferior cloth, known as seconds and which usually consists of cloth with thin areas or wavy areas.

Another important object of the invention is to provide an improved letoff mechanism for looms wherein the usual external gear is maintained in operation in a smooth and even manner and also to the extent that while this manner of operation reduces the amount of inferior cloth it also reduces wear on the letoif pinion shaft and external gear.

Other objects and advantages of the invention will become apparent to the reader of the following specification:

In the drawings:

Figure 1 represents an end elevational view.

Figure 2 is a fragmentary side elevation. Figure 3 is a fragmentary cross sectional view longitudinally of the apparatus.

Figure 4 is a front elevational view of the improved letoff pinion shaft arm unit.

Figure 5 is an end elevational view of the arm shown in Figure 4.

Figure 6 is an inside elevational view fragmentarily showing the letoff pinion shaft arm unit.

Referring to the drawings wherein like numerals designate like parts, it can be seen that numeral 5 represents the pinion shaft which carries the pinion (not shown) and on which is also located the ratchet Wheel 6 and gear I, both being conventional features of a loom letoif.

Numeral 8 denotes the usual letoff outside bearing carried by the shaft 9.

In carrying out the present invention, the

pinion shaft handle hub ID has two pair of ears,

namely the pair of ears II and the pair of ears I2, the latter being disposed from the hub at a position diametrically opposite from the ears II.

A pinion shaft handle I3 is swingably mounted as at I4 between each pair of ears III2 as is clearly shown in Figure 3.

In further carrying out the present invention, the improved pinion shaft arm unit generally referred to by numeral I5 consists of the internal hub I6 across the inner end of which extends the channeled carrier IT for the pawls I8 and I9.

These pawls I8-I9 are beveled at their internal gear engaging ends as at 2t and are in the form of arms 2| rockably supported as at 22 and having their inner reduced ends 2-3 in the path of the slide pin 24. These slide pins have their outer ends in the path of the lugs '25 on the inner 5 ends of the pinion shaft handle I3.

Springs 25 are interposed between the channeled cross member I7 and the pawl arms 2I2I for normally urging the beveled pawls I8 and I9 into engagement with the ratchet 10 wheel 6.

In the patent to Roper No. 848,181 the pinion shaft Ba: corresponds to the pinion shaft 5 clearly shown in Figure 3 and the handle 26 in that patent corresponds to the handle I3 which 15 is clearly shown in Figures 1 and 2 of the present drawings. The operation of the letoff pinion shaft arm as now used on present day looms and which is only single in number as in the Roper patent is often irregular in operation and pro- 20 duces wear that can be overcome by the employment of these handles in diametrically opposite positions as illustrated in Figures 1 and 2. The letoif pinion shaft arm now employed on most looms has only one pawl to contact the teeth on the ratchet wheel 6, whereas the present in- 2 vention employs two pawls with the marked tendency to eliminate the one sided wear that is caused by the singly provided type. Through the pins I6 a more even operation of the pawls 2I is obtainable.

While the foregoing specification sets forth the invention in specific terms, it is to be understood that numerous changes in the shape, size and materials may be resorted to without departing 35 from the spirit and scope of the invention as claimed hereinafter.

Having described the invention what is claimed as new is:

In a loom, a letoff mechanism including a 40 letoff pinion shaft, a ratchet wheel on the pinion shaft, a letoif pinion shaft arm assembly, a pinion shaft handle assembly, said pinion shaft arm assembly including a pair of pawls mounted on the shaft and for engagement with the ratchet 45 DEWEY L. MOORE. BEN O. MORROW. 

